CVE-2026-21511
Analyzed
Analyzed - Analysis Complete
Deserialization Vulnerability in Microsoft Outlook Enables Network Spoofing
Publication date: 2026-02-10
Last updated on: 2026-02-11
Assigner: Microsoft Corporation
Description
Description
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | sharepoint_server | 2019 |
| microsoft | sharepoint_server | 2016 |
| microsoft | 365_apps | * |
| microsoft | 365_apps | * |
| microsoft | office_long_term_servicing_channel | 2021 |
| microsoft | office | 2019 |
| microsoft | office | 2019 |
| microsoft | word | 2016 |
| microsoft | word | 2016 |
| microsoft | office_long_term_servicing_channel | 2024 |
| microsoft | office_long_term_servicing_channel | 2021 |
| microsoft | office_long_term_servicing_channel | 2021 |
| microsoft | office_long_term_servicing_channel | 2024 |
| microsoft | office_long_term_servicing_channel | 2024 |
| microsoft | sharepoint_server | to 16.0.19127.20518 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-502 | The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. |
